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Modified graphene oxide concrete crack repairing material and preparation method thereof

A technology for repairing cracks and oxidizing rocks, which is applied in the field of modified graphene oxide concrete crack repairing materials and its preparation, which can solve the problems of high cost and huge cost, and achieve the effects of preventing segregation, promoting fluidity, and simple production and repairing processes

Active Publication Date: 2018-11-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) The cost is relatively high. For example, the annual cost of crack repair in the United States is 18-21 billion US dollars, and the annual cost of concrete crack repair in my country is also very huge (Jiang Shenyang, Li Jing, Zheng Yujie, etc. mixed with sodium silicate repair Research on Life Prediction of Self-healing Concrete Repaired by Self-healing Agent and Optimal Restoring Agent Dosage. Concrete, 2018, (2): 75-79; Shao Yunda. Research on New Materials for Concrete Crack Control. Master Thesis of Beijing University of Technology, 2006; Ma Qianli , Xu Weimin. Factors Affecting Concrete Durability in Shoals and Improvement Measures. China Science and Technology Information, 2011, (15): 69);

Method used

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  • Modified graphene oxide concrete crack repairing material and preparation method thereof
  • Modified graphene oxide concrete crack repairing material and preparation method thereof
  • Modified graphene oxide concrete crack repairing material and preparation method thereof

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preparation example Construction

[0038] The invention provides a method for preparing a modified graphene oxide concrete crack repair material, specifically a method for preparing a large-scale single-layer modified graphene oxide reinforced and toughened concrete crack repair material, comprising the following steps:

[0039] Step 1, prepare the modified graphene oxide dispersion with terminal mercapto groups, see the chemical reaction process figure 1 : Add 40 to 60 parts of graphene oxide dispersion liquid with a mass fraction of 2 to 2.5% into 90 to 100 parts of water and stir evenly, then add 0.1 to 0.3 parts of N-hydroxysuccinimide and 3.0 to 4.5 parts of L -Cysteine, feed nitrogen gas, stir and react at 25~30°C for 7~8 hours, centrifuge the product to obtain slurry modified graphene oxide with terminal sulfhydryl groups, use deionized water to disperse and control The mass fraction of the modified graphene oxide dispersion is 0.6%~0.8%;

[0040] Step 2, prepare 3-butynyl 2-bromo-2-methylpropionate, se...

Embodiment 1

[0053] Prepare the modified graphene oxide concrete crack repair material, the preparation steps are as follows:

[0054] Step 1, prepare a modified graphene oxide dispersion with terminal mercapto groups:

[0055] Add 40 parts of graphene oxide dispersion liquid with a mass fraction of 2% to 90 parts of water and stir evenly, then add 0.1 part of N-hydroxysuccinimide and 3.0 parts of L-cysteine, feed nitrogen, and The reaction was stirred and reacted at ℃ for 7 hours, and the product was separated by centrifugation to obtain slurry-like modified graphene oxide with terminal mercapto groups. Deionized water was used to disperse and control the mass fraction of graphene oxide to 0.6%.

[0056] Step 2, prepare 3-butynyl 2-bromo-2-methylpropionate:

[0057] Add 10 parts of 3-butyn-1-ol, 60 parts of tetrahydrofuran and 8 parts of triethylamine into the reactor, blow nitrogen into it, and slowly add 6.4 parts of 2-bromo-2 -Methylpropionyl bromide, stirred for 10 hours, added 80 p...

Embodiment 2

[0077] Prepare the modified graphene oxide concrete crack repair material, the preparation steps are as follows:

[0078] Step 1, prepare a modified graphene oxide dispersion with terminal mercapto groups:

[0079] Add 60 parts of graphene oxide dispersion liquid with a mass fraction of 2.5% to 100 parts of water and stir evenly, then add 0.3 parts of N-hydroxysuccinimide and 4.5 parts of L-cysteine, pass into nitrogen, at 30 The reaction was stirred and reacted at ℃ for 8 hours, and the product was centrifuged to obtain a slurry-like modified graphene oxide with terminal mercapto groups. Deionized water was used to disperse and control the mass fraction of graphene oxide to 0.8%.

[0080] Step 2, prepare 3-butynyl 2-bromo-2-methylpropionate:

[0081] Add 15 parts of 3-butyn-1-ol, 80 parts of tetrahydrofuran and 12 parts of triethylamine into the reactor, blow nitrogen into it, and slowly add 7.4 parts of 2-bromo-2 -Methylpropionyl bromide, stirring and reacting for 15 hours...

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Abstract

The invention relates to a modified graphene oxide concrete crack repairing material and a preparation method thereof. According to the invention, a sulfydryl-terminated modified graphene oxide dispersion and alkynyl-terminated poly(hydroxypropyl acrylate) are firstly prepared; a large-sized monolithic graphene oxide dispersion is obtained through a clicking reaction of a sulfydryl group and an alkynyl group; and a concrete crack repairing material is prepared by mixing the large-sized monolithic graphene oxide dispersion with concrete components. According to the invention, the uniform large-sized monolithic graphene oxide dispersion is doped into the concrete crack repairing material to promote formation of a regular and uniform hydration product which is aggregated to form an intertwined and cross-linked compact structure, so the best repairing effect to concrete cracks is achieved; meanwhile, a functional waterborne polymer is introduced, so product performances are optimized; andthe modified graphene oxide concrete crack repairing material provided by the invention has the advantages of low cost, simple generation and repairing processes, good social benefits and economic benefits, and practicality.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a modified graphene oxide concrete crack repairing material and a preparation method thereof. Background technique [0002] At present, the use of graphene oxide in cement-based composite materials is a research hotspot. People hope that the use of graphene oxide can solve defects such as cracks and leakage in concrete, improve its strength and toughness, and make it crack-resistant, leak-proof, and anti-corrosion. Corrosion and volume stability, improve its durability and service life. Graphene oxide in concrete mainly affects cement hydration products and their aggregate structure, and promotes the cement matrix to form a dense and regular microstructure and macrostructure formed by the interweaving and crosslinking of regular-shaped cement hydration products (Wang Jian. Graphene oxide on Research on the performance influence and mechanism of cement. Beijing Unive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B111/72
CPCC04B28/06C04B2111/72C04B2201/50C04B7/02C04B18/08C04B14/068C04B22/00C04B22/082C04B22/142C04B22/149C04B24/26C04B14/024C04B2103/302C04B24/2652
Inventor 吕生华刘锦茹刘雷鹏习海涛
Owner SHAANXI UNIV OF SCI & TECH
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